If the bill doesn't need to be reversed and the allocations put against the new posting you can do the below to reissue the cheque:
Select General Postings.
Select BPO and create a posting with a minus for the same value and use the same VAT rate.
After the minus BPO post another positive BPO to reinstate the disbursement and create a new cheque.
You can then bill the minus and positive together via a SIB posting in General Postings.